Math Tips: Doing Math in Your Head

You might be amazed at the calculations the average student could do in their heads if they knew a few tricks.

It's also a pretty cool way for the kids to impress their teachers and friends.

Let's say you're multiplying a couple of two digit numbers with the same first digit. And their second digits add up to ten...like 43 times 47.

Here's how to do it quickly in your head:

Multiply first digit by one number greater than itself: 4 times 5 = 20.

So the first part of the answer is 2 0 _ _.

Then just multiply the two second digits together; 7 times 3 = 21.

the last part of the answer is _ _ 2 1.

So 47 × 43 = 2021.

Pretty neat. With a little practice it's easy. There are many more math multiplication tricks the kids can learn.

Check it out here.